Multiple-cylinder grinder



C. KNOWLES MULTIPLE CYLINDER GRINDER Filed larch 18, 1925 3 Sheets-511901: 1

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Jan. 1- 17, 1928.- 1,655,331 v i c. KNOWLES MULTIPLE CYL iNDER GRIND ER Filed Manon .18, 1925- s Sheets -.S poot 2 r 2; I lqgzrmm i C. KNOWLES MULTIPLE CYLINDER GRINDER Filed March 18, 1925 5 Sheets-Shut 3 iii iii)

Patented Jan. 17, 1928.

UNITED STATES PATENT OFFICE.

CARROLL KNOWLES, OF HARTFORD, CONNECTICUT, ASSIGNOR T PRATT & wnrTNEY COMPANY, or NEw YORK, N. Y., A CORPORATION or NEW JERSEY.

MULTIrLE-cYLINDER- GRINDER.

Application filed March 18, 1925. Serial No. 16,343.

This invention relates to grinding machines and particularly to an internal grinding machine for simultaneously gr nding the bores of an automobile engine. cylinder.

It is an object of the invention to provide a table onwhich may be carried an engine body to be ground, and to provide in'iproved means for actuating the table bodily in a planetary path so that each of the cylinder bores may be simultaneously engaged by its grinding wheel.

()ne feature which is advantageous is that I provide two adjustable or compound oecentrics, the radius of throw of which may be simultaneously varied, these eccentrics being located one in the forward part of the table and the other onetoward the rear so lowing speeification and illustrated in the "accompanying drawings.

In the accompanying drawings annexed hereto and forming a part of this specification, I haveshown my invention embodied in a machine for simultaneously grinding all of the cylinder bores of an automobile engine, but it will be understood that the inventioncan be embodied in dillerent machines and that the drawings are not to be construed as defining or limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose. y H

1n the drawings: i Figure 1 IS a side elevationioif the complete grinding machine, parts being broken away to more clearly disclose their construction.

Fig. 2 a front elevation of the complete machine.

Fig. 3 is a plan view of the work supporting table and actuating means therefor, the

moved,and i i p Fig. 4. is a detail vlew of the rear eccentric and its mounting relative to the table.

housings and spindle supports being re- In the above mentioned drawings I have shown but one embodiment of the invention which is now deemed preferable, but it is to be understood thatchanges and modifications may be made within the scope of the appended claims without departing from the spiritof the invention.

Briefly and in its broadest aspect, my invention comprises the following principak parts first, a base; second, a work supporting table or platen movable upon an upper surface of the base; third, actuating means for bodily moving the table/in planetary paths of different radiiyfourth, grinding wheels for each of the cylinder bores; and fifth, means to support,traverse and rotate these wheels during the movement of the table. v Referring more in detail to the figures 0t the drawings, I provide a base 10, on which may be mounted a table 11. This table ll is adapted to move about upon a plane horizontal surface formed on the base 10. Preterably, and as shown in Fig. 3, the table 11 is provided with a rearward integral extension 12 and its forward portion is widened sufiiciently to properly ;mount and support an automobile engine cylinder body.

Supported. on the base 10, upon opposite sides ofthe rear, are columns or housings 13 on which is movably mounted a cross rail 14. On this cross rail 14' are wheel heads 15 which may be adjusted along the rail 14 and clamped securely inposi-tion thereon. Each head .15 is provided with a spindle 16 rotatably mounted within its. head and provided at its lower end with a grinding wheel 17.

A pulley 18 splined to the upper endsof the spindles 16 provides means for rotating it as by means of belts 19 extending over a plurality of pulleys 20 mounted on a shaft 21 i on the columns 13. This shaft 21 may, as

3 shown in Fig. 2, be driven from a main driw ingpulley 22. I p In order to raise. and lower the grinding. wheels 17 simultaneously during operation,

screws 25 are provided, the said screws being held against end-wise movement and sup ported upon the forward. surfaces of the columns .13. By rotating these screws 25 in opposite dircctionsby any preferredmeans,

the cross rail Hand abrasive wheels 17 may be raised or lowered to properly engage 5 them with the full length of the cylinder lbores on the work W. In order to rotate eccentric.

these screws 25 a gear box 26 is provided on one of the columns 13 having a driving shaft 27 extending therefrom to any suitable source of power. As the invention does not relate to any specific form of wheel actuating or rotating mechanisms, it is not thought that further description of these parts will be necessary.

In order to actuate the table 11 in a planetary path to simultaneously engage each of the grinding wheels 17 respectively with the surfaces of the different bores of the cylinder body W, two eccentrics 30 and 31 are provided each of the compound type, so that theirthrow or eccentricity may be widely varied. It will be understood that the movement of the table in its planetary path causes the wheels to engage the entire eircumference of the different bores of the cylinders. Also this planetary movement must vary for cylinders of different diameters and to compensate for the wheels being gradually reduced in size by wear. 'The ec-' centrics are therefore designed so that they may be adjusted to vary this planetary movement of the table over wide limits. For convenience the eccentrics are designed for simultaneous adjustment during operation and in all positions of adjustment the eccentricity or throw of the members in engagement with the table is always precisely equal. These eccentrics, as shown clearly in Figs. 1 and 2, comprise shafts 32, the upper ends 30 and 31 of which form the parts engaging the table 11. The shafts 32 are mounted eccentrically within sleeves 33' s shown in Fig. 1. .The forward eccentric 30 is retained within a bored hole in the table preferably provided with a bushing 34 within which the extension 30 is free to rotate. The rear eccentric 31 is preferably freely rotatable within a block 35 slidably mount ed in an elongated openin 36 provided in the table 11. Except for this manner of connecting the eccentrics 30 and 31 with the table 11 the construction of the assembled eccentrics is identical. A description of one of the compound eccentrics will fore sufiice for both.

To angularly position the eccentric sleeve 33 relative to the second eccentric sleeve 39 surrounding it to vary the eccentricity of the shaft 32 and its extension 30 or 31, two worm wheels 37 and 38 are provided for each One worm wheel 38 is adapted to rotate the sleeve 33 within-the second eccentric sleeve 39 and a. second worm wheel 37 is adapted to directly engage the outer sleeve 39. It will be seen that'if these worm wheels 37 and 38 are rotated relatively to each other the angular position of the eccentric sleeve 33 will be changed relative to the eccentric sleeve 39 and theamount of eccentricity of the eccentric 30 or 31 will be changed relative to the axis about which the there rectly keyed to shaft 45.

of each of the sleeves 33 and the sleeves 39.

By simultaneously rotating the worm wheels 37 and 38 in the same direction and at the same speed, the eccentrics 30 or 31 will he revolved in a circleof constant diameter, that is, with constant eccentricity, and the table will be given its planetary or operative movement.

In order to rotate the eccentricsleeves 33 and 39 constantly so that there will be no angular change between the sleeves, worms 40 and 41 are provided in engagement with the worm wheels 37 and 38 on each of the compound eccentrics. One pair of the worms (for driving the sleeves 39) is on a driving shaft 42 and the other pair of worms (for driving the sleeves 33) is driven therefrom through intermediate gearing presently to be described. No 'mally and'during operative rotation of the driving shaft 42 an interinediate gearing rotates the sleeves 33 39 at identical speeds.

In order to vary the eccentricity of the eccentrics 30 and 31 relative to their axes of rotation to vary the planetary movement of -the table, a. differential driving niech anism 44 is interposed in the driving mechanism for shaft 45 carrying the worms 41 so that the planetary movement of the tableill may be varied while the machine is in operationj This differential mechanism 44 is clearly shown in 'Fig. 1 and comprises two opposedbevel gears 46 and 47 within arotatable housing 48; one of the bevel gears 46 is driven by the main driving shaft 42 and the other gear 47 is directly attached to one of the driving gears 49 for the second shaft Meshing with. these'bevel gears 46 and .47 are bevel pinions 5O rotatably 'inounted in the rotatable housing 48 and having a worm and,

wheel 51 on its periphery. If there is no rotation of this housing 48 and "worm wheel 51, the bevel gears 46 and 47 arc/rotated at the same speed in opposite directions and the two shafts 42 and 45 are constantly rotated at identical speeds; Gear 490a bevel gear 47 meshes with an idler orintermediate gear 53 which is in mesh with a gear 54 di- As the gears 49 and 54 have equal numbers of. teeth the shaft 45 will rotate at the same speed as the gear 49 and consequently at the same speed as driving shaft 42. By angularly adjusting the position of the housing 48, the second bevel gear 47 will be rotated relative to the first bevel gear 46 and thus, through the 7 driving gears 49, 53 and 54, the lower worm wheel 38 will be angularlv advanced rela tive to worm wheel 37. Thisangularlyadvances the sleeve 33 relative to the eccentric his sleeve 39 of each of the compound eccentrics and thus varies the position of the eccentricsofthe engine cylinder body being ground. Thisnecessitated highly accurate machining and precise identity of eccentricity and angular relationshlp of the two OCCBllbllCS to avoid valuations 'lIl diameters of the bores of the cylinders at one end com iiared to those at the other end and to function smoothly. The present invention comprises an improved arrangement over this construction by locating the eccentrics in sucha manner that a lesser degree of accuratemachining is permitted and identity of eccentricity of the two compound eccentrics has a lesser effect upon the ultimate identity or uniformity of the bores which are ground.

It will be seen in Fig. 3 that one of the eccentrics is positioned approximately in the center of the forward end of the table 11 and substantially at the mid portion of the engine cylinder body V. The second eccentric 31. is mounted in the rearward exll-CHSIOII 12 of the table 11 and at a distance remote from the engine cylinderbody It will therefore be seen that the diameters of the bores being ground in the cylinder body W will be governed primarily by the eccentricity of the front eccentric 30 and that the function of the second eccentric 31 is to give the table a correct planetary path. Also by mounting the second eccentric 31 on the table extension 12 in rear of the engine cylinder body lV, it may engage a sliding block 35 in the table 11 mounted so that itmay adjust itself along a line connecting the two eccentrics 30 and. 31. This-mounting for the rear eccentrieZ-l]. therefore permits simple machining and eliminates the necessity of the openings in the tablebeing accurately bored for the eccentrics, as there is no possibility of any binding action taking place;

To adjust the eccentricity of the eccentrics 30 and 31 simultaneously to compensate for wearing away of the wheel or to ad ust the mechanism for a different diameter of bore,

manual means are provided for rotating the housing 48. A worm in mesh with worm wheel 51 011 the housing 48 is rovided on a laterally extending shaft 61,. n this shaft 61 is a bevel gear 62 in mesh with a. corresponding gear 63 on a forwardly extending shaft 64. A. hand wheel 65 on the forward end of this shaft Gahwhich is preferably provided with graduations 66, permits accurate adjustments of the housing 48' and therefore of the eccentricity of the eccentrics 30 and 31.

\Vhat I claim is:

body, wherebythe table may be actuated in a planetary path of predetermined radius.

2. A machine for simultaneously grinding the bores of a multiple cylinder engine hav ing its cylinders disposed in a straight line comprising in combination, a base, a table for supporting the work to be ground, a plurality of rotatable,abrasive wheels, means for relatively moving the wheels and table to engage the wheels along the length of the bores being ground, adjustable eccentrics engaging the table, one of said eccentrics being positioned at the mid portion of the cylinder body, whereby the table may be, actuated in a planetary path of predetermined radius, and means to adjust the eccentrics during operation.

3. A machine for simultaneously grinding the bores of a multiple cylinder engine cO1I1- prising in combination, abase, atable for supporting the work to be ground, a plurality of rotatable abrasive wheels, means totraverse the wheels to engage them with the bores being ground, variable throw ec centrics engaging the table, one of said eccentrics being positioned adjacent the mid portion of the cylinder body being ground, and the other eccentric spaced therefrom in symmetrical relation to the end bores of the cylinder body, and means to simultaneously rotate said eccentrics. j

4. A machine for simultaneously grinding the bores of a multiple cylinder engine having its cylinders disposed in a straight line comprising in. combination, a base, :r

lll)

means to traverse the wheels to engage them 7 with the bores being ground, and variable throw eccentrics engaging the table, one of i ,said eccentrics being positioned adjacent a mid-portion of the work being ground, and the other eccentric spaced therefrom in a direction normal to the lineof the cylinders.

5. A machine for simultaneously grinding the bores of a multiple cylinder englne comprising in combinatioma base, a table for supporting the work tobe ground, aplural ity of, rotatable abrasive wheels, means to traverse the wheels to engage them with the bores being ground, a rotatable eccentric in engagement with the table, a supplementary eccentric rotatable Within the base and slidably engaging the table whereby rotation of said eccentrics will cause movement of said table in a planetary path, and means to adjust the eccentricity of said eccentrics.

6. A machine forsimultaneously grinding the bores of a multiple cylinder engine comprising in combination, a base, a table for supporting the work to be ground, a plurality of rotatable abrasive wheels, means to traverse the wheels to engage them with the bores being ground, a rotatable eccentric in engagement with the table, a supplementary eccentric slidable relative to the table in a direction normal to the line of cylinders being ground, whereby rotation of said eccentrics will cause movement of said table in a planetary patlnand means to adjust the eccentricity of said eccentrics during operation. j

T. A. machine for simultaneously grinding the bores ot a multiple cylinder engine com prising in combination, a base, a table-for supporting the work to be ground, a plurality oi? rotatable abrasive wheels, means for relatively moving the wheels and table to engage the w reels along the length of the bores being ground, an adjustable eccentric engaging the table adjacent the mid-portion of the work being ground, a second adjustable eccentric spaced therefronrand slidably engaging the table, means to simultaneously rotate said eccentrics, and means to simut taneously adjust the eccentricity of said eccentrics.

8. A machine for simultaneously grinding the bores of a multiple cylinder engine comprising in combination, a base, a table for supporting the work to be ground, a plurality o't' rotatable abrasive wheels, means for relatively moving the wheels and table to engage the wheels along the length of the bores being ground, an adjustable eccentric engaging the table in a circular'opening therein, a second adjustable eccentric slidably engaging the table within an elongated opening therein extending in a direction normal to the cylinders being ground, means to simultaneously rotate said eccentrics, and means to simultaneously adjust the eccentricity of said eccentrics.

In testimony whereof, signature;

I hereto afiix my CARROLL KNOWLES. 

